The 23-minute statistic is not a universal focus timer

Sep 30

What the number means

In a June 2006 Gallup interview, UC Irvine researcher Gloria Mark said work interrupted and resumed on the same day was resumed, on average, in 23 minutes and 15 seconds. She described roughly two intervening tasks. This is elapsed time to resume that work in the observed setting, not a finding that people were unproductive throughout the interval.

The broader research

Mark, Victor Gonzalez and Justin Harris’s 2005 paper reports detailed observations of 24 information workers, fragmented work and intervening activities before resumption. A separate 2008 experiment found interrupted tasks completed faster, with no quality difference, while participants reported more stress, frustration, time pressure and effort. Timing alone did not describe the whole experience.

Do not turn it into a calculator

Do not multiply every switch by 23 minutes and label the total recovered productivity. Instead, observe which interruptions leave work unfinished and which returns require rebuilding your place. That is a personal review suggestion, not a validated measure. Keep the literature finding, its setting and your actual work separate.

A better personal interruption log

Imagine a morning with a necessary support call, a useful reference lookup and a reflex visit to a social feed. Counting three switches hides why they happened. For a proposed personal log, note the reason for the change, whether the prior work was left unfinished and what you needed to do on return. Do not calculate a loss by multiplying the count by a published mean.

You can use the log to choose one change: protect a block from optional messages, leave a restart note, or keep needed reference material easier to find. These are options to test, not effects established by the cited studies. A return that takes longer may also involve useful intervening work. The aim is understanding your own interruption pattern, not proving that every detour was waste.